Clutch



- l, 4 Au 29,1927. MESA 6385 2 CLUTCH Filed May a. 1924 men/0r: V Jasel2 'a-Mesa- Patented Aug 9, 1927. i

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JOSEPH o. MESA,"OF'EAST oaauezsluaw JERSEY, ssIGNoa-rro wnsr-Emv nrzrzora'ro "COMPANY, mcom mm or NEW YO K, N. ;Y., A co'aroaAr-Iouorwnw YoRK;

- OLUTGH'.

.Application filed May [8, .1924. 1 Serial m. 211,752.

,This invention relates to a .clutch and more ,pamticularly tot-amagnetically operated friction clutch. I g Y 1 In certain types ofequipment, such, for example, as printingtelegraph and picturetransmission equipment, .itlis desirable to drive rotating members at aii niform-speed by meansof low powered ,motor-s. Bhonic Wheels are.often used for this purpose- .In

order that the rotating anembermayhei stopped Without stopping themotor,,friction drives have been used in the past to couple the rotating.member to the .motor'and detent eonithe rotating .member has been usedto prevent rotation thereof. If the detent ismuch in use, the frictionsurfaces are subject to considerableqwear which eventually resultsinslippage-between the faces. For

systems requiring exact .synchronism of two rotating members duringconsiderable per od of tlme, suchas the synchromsm .re-

quired between the rotating drums in a pictnre ltransmission system,slippage in the frictlon drive s fata l 'lo prevent shpgpage, an undueamount :of malntenance is required.

.An object of Lthe present invention is to I reduce maintenance in afriction drive Without simultaneously increasing the power :loss thereinand complicating the equipment.

Another object is to eliminate axial movement of a driven rotatingmemberduring rotation." v V In one embodiment of the invention, friction'surfaces carried 'by a driving vand a driven member are forced intoengagement with one another by a magnetically operated clutch arm. Ballbear'mg rollers mounted on the clutch arm have rolling engagement .Withone of, the friction members. A clutch is thus providedin which there'is substantially no Wear on the frictionsur faces and very little powerused up in-t'he clutchfitself. The pressure exerted by the clutch armfurthermore prevents axialmovement of the driven member during the timethat it isbeing driven.

d method of operation together with other objects advantages thereof; beL furscri'ption having ,refermce to the naccom- .2 d5 ranlend' view ofthelsame the-deft hand bearing of Fig. 1 removed in order tobetter'shovvthe mounting ofthe clutch arm. v

.3 is..a,fragmentary view of .the frice tion members partially. in.crosssection isa side View a the hutch ma motor farrangement showingthe magnetL cally opera-ted clutch arm;

showing the mounting of the ball bearing rollers.

Fig. tisalside View time clutch sh wiiig' the friction :surfaces .inengaged (position.

fPiroceeding now. to thegdetailed desoription, a phonic vvheel5 mountedon a tram.

6 is provided Witha pinion 7 for. driving 7 gear Wheel 8.; The gearWheel "8 is rotatively mounted on ashaft 19 which fis'itself rota'tlvely supported by bearing members 10 and 11;. "On o pposite sides ofgear Wheel 'S'are frlction surfaces 12 and .13 A friction-disc 14 issecuredto'shaft 9 on oneside of gear Wheel 8. Another friction disc 1'5on the other side of gear whee l '8 is also'1n0unted'on shaft 9 by meansof a key-32, slidable infla key Way. The disc '15" is'thus held in fixedangiflar relationship with respect to shaft 9 but allowedtto moveaxial-1y there-along.

On the face ofeach of the discs 14 {and 15 are. secured friction members16, 16 of any suitable material suchlas cork. 'The friction surfaces12and1i3'o'f gear Wheel '8 are pref- I era'bly of polished bronze. 'Thepinion 7 and gear 8 'have hel-ica-l teeth.

The-disc 15 with its friction member ltiis v forced into engagement Withthe friction surface 12 of gear Wheel 8 by means of clutch arm"l'7.'This clutch arm is pivoted at 18 toa r'nember'19 Which'in turn issecured to thefframe 6, lvl'oumtedon a support '20 which is also.secured'to the frame 6 is an electromagnet 21' :vvhich is adapted. whenenergized to attract an armature .22 secured to the upper :end of clutcharm 117...

armature .22 is held in .retractedfposition "by coil spring 23, it'sbackvvard travel being lim:

ited by a spring. stop 24. Mounted lonop- V posite faces within asubstantially square hole in clutch arm 17 and on diametrically oppositesides of shaft 9 are rollers 25, 25. These rollers are provided withba'll -bearlngs 26 which ride on screws 27,27. The rollers 25, 25 haverolling engagement with the l surface 29' of frictiondisc 15.

v is in retracted position, the disc is moved IMhen the armature-22 onclutch arm 17 away from gear wheel 8 by the engage,- ment of the headsof screws27, 27 with the collar 30. In this position there is sufiicientfreedom of movement of gear wheel 8 in an axial direction alon'g'shaft 9so that the friction surfaces 12 and 13 have very slight .engagementwith friction -members 16, 16.

Thus, there is very littlefwear on the friction members when the shaft 9is stationary -even though gear Wheel '8 is revolving.

When the magnet 21 is energized and the armature 22-is in attractedposition as shown in Fig. l,'the friction surfaces are forcedintoengagement and the'shaft 91s driven at the same rate as the gear Wheel8.

,Under this conditioulikewise, there is no Wear on the friction surfacesbecause there isno slippage therebetween, N I

.lVhen the magnet 21 1s energlzed and the clutch faces are inengagement, there 1s a tendency for the shaft 9 to be pushed axiallytoward the right. 'The extent of this movehers is mounted on movestllBIGWltll.

ment .is limited by the collar 31 secured to the: shaft 9 coming intoengagement with" v the bearing support 11 Thus the shaft dur- I 111g itsrotation' alwaysioccupies the same relative position with respect to theframe 6 and end play is eliminated during such time. This is not thecase with the well known friction drives wherein the spring which causesthe engagement of the friction memthe rotating shaft and In picturetransmission equipment, to

which applicants clutch is especially applicable, this elimination ofend play is very valuable. The axial position of the shaft 9 determinesthe position of the. picture drum (not shown). In such a system, withwhich this invention is particularly adapted for use, the axial movementof the picture drum during its rotation must be uniform or the picturewill be streaked. The presence of end play would militate against suchuniformity. This would be especially detrimental where the picture isreproduced in the form of parallel lines of varying width.

The wear on the bearing surfaces of collar 31 and support 11 is not verygreat during long periods of use and, is entirely negligible during thetransmission of 'any'given picture. Any wear over. a period of time isautomatically taken care of by the end movement of the shaft 9, when theclutch is a engaged. Maintenance due to this cause is thereforepractically obviated.

as defined in the appended claims;

It is to be understood, however, that if suflicient load is placed onthe shaft 9 or it is stopped. in any manner, there will then be slippagewhich protects the apparatus from strain. This is a real advantage. Thiscondition is exceptional, however, and nor- Y mally there is no wear onthe friction'sur faces so that the amount of maintenance is reduced to aminimum, This type of friction drlve for the picture drums in picturetransmission equipment is especially advantageous, because the driveWhat isclaimed is: I

driving shaft, a pinion fixedly mounted on By arranging for the sim'ul-Y an. 1. In combination, a clutch comprising a" said shaft, a gearinterlocking with said, if

pinion and having friction surfaces on op-Y posite sides, a driven shaftarranged to rotatably support said gear, a pair ofdiscs" arrangedadjacent to the opposite sides of said gear, friction members secured tosaid discs and in engageable relation with the friction surfaces of saidgear, a pair of standards for supporting said driven shaft,

a collar fixedly mounted on said driven shaft adjacent to one of saidstandards, an

electromagnetic means for sliding first, one

of. said discs into engagement with one of said fr ction surfaces ofsaid gear and secondly, both disc and gear into engagement I with theother of saiddiscs to effect the rotation of said driven shaft, saidcollar being provided for the purpose of preventing the longitudinalmovement of said driven shaft when said gear engages the secondmentioned disc. i 2. In combination, a clutch comprising a drivingshaft, a pinion fixedly mounted on said shaft, a gear interlocking withsaid pinion and having friction surfaces on opposite sides, a drivenshaft arranged to rotat,-,

ably support said gear, a disc keyed to said driven shaft and slidablyarranged thereon and disposed adjacent to one of said friction surfaces,a second disc fixedly mounted on said driven shaft. anddisposed adjacentto the other of said friction surfaces, apair of standards forsupporting said driven shaft, a collar fixedly mounted on said drivenshaft and arranged in engageable re? lation with one of said standards,electromagnetic means comprising an armaturefor movlng sald firstmentioned disc longitudi- 1,638,542 r Y I 43 nally along said shaft toengage the rotating ciated with said rollersfor disengaging said gearand for further moving said disc to first mentioned disc and gear whensaid cause the interengagement of said 'gear and armature is retracted.

said second mentioned disc, a plurality of In witness whereof, Ihereunto subscribe I 5 ball-bearing rollers attached to said armamy namethis 7 day of May, A. B51924.

ture for effecting the sliding movement of I said first mentioned disc,and means asso- JOSEPH O. MESA.

